Display Pcb - Kenwood DP-1100 B Service Manual

4-14. DISPLAY PCB

The display PCB does
not operate.
Refer to the description of signal pro­
cessing (CN5).
* When read-in has completed,
Remote control " H "
Tray " H "
R E S E T " H "
IRQ " H " (A pulse is output only when the play, pause, etc. button is depressed.!
D A T A 12 " H "
S C K " H " Signal is output only during play mode.
D A T A 2 1 " L "
Timing of the latch for lighting the L E D
0.8ms
J t n _ o
.5 msec, clock pulse
5 m s e c : Play and pause, anode scan signa
1 4 2
• P - 1 1 0 D B II ! D P - 1 1 D 0 B II
4. TROUBLESHOOTING
f he fluorescent display indicates
p o w e r o n .
Check the s w i t c h . Check the signal
level at IN port. Check IC3. Check to
Check the reset circuit. Check the grid
see if pin 37 of IC1 is high.
scan signal. Check the anode scan
signal. Check IC2.
®
( 4 - 7 )
( 8 . 9 . T i m e T r a y )
/Play, Pause, S T O P \
V
( F F , R E V UP, DOWN)
/Clear, Memory\
\
1
<
C h e c k t h e m i c r o p r o c e s s o r ( f o r
display). Check the signal level. Check
Check P-IC15 (signal p r o - „
the lead connection.
cessing PCB). Check to see
if the level at pin 36 of
P-IC8 shifts from high t o ^
low.
* Key scan timing
JtdLdh
5V
( 0 - 3 )
OV
Check the parts associated w i t h IC14
5V and IC15.
OV
SV
• OV
R E P E A T /
_JULIJIJ_ 5 :
M-Read /
D A T A 2 1
NO